A Peculiar Monarch: King Charles' Penchant for Opening Windows During Winter Leads to 'Banter' With Queen Camilla

King Charles III likes to keep palace and castle windows open year-round for fresh air — even during frigid winter temperatures!

"There’s a constant battle about it," Queen Camilla's sister, Annabel Elliot, told royal author Robert Hardman. "He will have opened it. She will creep in behind and shut it. So there’s a lot of: 'Oh, darling, you shut the window.' 'Yes, I have, because we’re all freezing.' So a lot of banter goes on.'"

"If the King usually wins on that front, Queen Camilla 'wins most other things,'" Elliot jokingly told Hardman. The author also shared how His Majesty's staff quipped: "If you ever wander around the royal buildings and are wondering where the King is, look for the flapping curtains."

These humorous insights are contained in the scribe's new book, Charles III: New King. New Court. The Inside Story," which also touches more upon the monarch's funny side.

"He does love being out and about in the countryside," Hardman told an outlet. "He’s always disappearing, and he’s got a particular thing at the moment with planting trees. He’s obsessed with it. He’s always liked planting trees. He used to get mocked for it slightly because whenever he planted a tree, he’d always shake one of the leaves by the hand and say, 'Good luck, tree.'"

He continued: "The tree planting has gone up a notch since he became king," Hardman shared. "He is now planting so many trees. I talked to one of his staff, and he said, 'Well, we often joke, Where’s the king? He is probably planting trees.' And it turns out... he is planting trees. He’s not at his desk; he’s out in the garden."

The tome also revealed that Charles III is a stickler for maintaining a strict exercise regimen that he developed during his time in the Armed Forces, all the way back in the 1970s. Before his recent successful prostate operation at age 75, the King's only other health concern was a sporting accident that broke his elbow and required surgery in 1990.

The monarch of 14 nations apparently likes to poke fun at himself as well by wearing a tie that is printed with small T. Rex dinosaur symbols, which is a pun based on his Latin initials.

"His favorite [tie] has a little T-Rex motif on it," Hardman dished. "I thought, 'That’s a bit odd. I keep seeing this tie with a dinosaur on it...' Of course, his cipher says, C. Rex, Charles Rex. So, I think he’s having a little joke about being king with his tie. But he’s in a good place. He’s a happy monarch."

"Rex" is Latin for the word king, and always follows a male monarch's name in official royal statements.

Hello! reported on excerpts from Hardman's book.